Capped carbon pencil.



J\ G. ETERSON.

CMPED CARBON PENCIL,

APPLICATEOH man OCT. 25. 19:6,

Patented July 31, 1917.

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,J'OHANN G. PETERSON, 0F CITY, NEW JERSEY, ALSSIG'NUR TO MANHATTAN ELECTRICAL SUPPLY COMEANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION or New JEnsEY.

GAYED CARBON PENCIL.

- Specification of Letters Patent.

I Application filed October 25, 1.916. Seria1 Ne.127,530.

To all whom it may concern: w

Be it known that l, JonANi-i G. Pn'rsnson, a citizen of the United States, residing at Jersey City, in the county of Hudson and State of New Jerscy,'have invented certain new and useful lni 'iroveinents in apped Carbon Pencils, of which the following is a specification.

This invention relates to capped carbon pencils, or as they are sometimes known pins, such as are used for instance in dry batteries. l have two aims in View, one the provision of means whereby the cap will hug or en'ibrace the pencil or pin in a tight and substantial manner? Another aim is the provision of means for securing a better electrical connection between the cap and the pencil than is at the present time possible.

In the drawings accompanying and forming part of the present spceificalion'l show one convenient form oil. einlnn'liinent of the invention which will be forth fully in. the following description. Ido not restrict myself to this disclosure; I may depart therefrom in several respects within the scope of the invention defined by the claim following said description. By the structure shown I can secure both the olnects in View, although this may not be necessary in all cases. In this particular disclosure the cap tigl'itly fits the pencil or pin and. the engagementbetwcen' the parts is through multiplicity of points rather than a surface engagement." This I obtain for instanceby con-ligating the cap. In View of this corrugation I can also insure the tight lit to-wliieli I lime alluded.

Referring to the drawings:

Figure 1 is an elevation of a battery equipped with a capped carbon pencil in.- volving; the invention, the upper portion of the battery being broken away and in sec-- tion.

Fig. 2 a top plan view of the cap.

Fig. 3 is a View in elevation the upper portion of the pencil, equip 'ied with a cap shown in section.

Fig. is a vertical sectional View of the cap, and

Fig. 5 is a horizontal section. thereof, the

section being on the line 5-5 of 4, looking in the direction of the arrow.

Like characters refer to like parts througliout'the several. views, the scale of Figs. l and 5 being larger than that "of Figs. 1,2and3. I

In F l l have shown an ordinary dry battery 2 furnished with carbon pencil 3 which except as to its-capped portion may be and preferably is of the ordinary eonstruetion. Surrounding the upper end of. the pencil 3- is a cap such as'that denoted in a general Way by l. This cap may he made from sheet metal such as brass. The cap comprises a practically cylindrical body 5 and a top 6. This body 5 is shown c0rru galte il 'as at 7, commencing with the upper end and extenailing: nearly to but short of the lower edge. By making the body corrugated, it is possessed of a certain amount of expansibility and necessarily contraetihility, in View of which it is resilient and can closely embrace the upper end of the pencil 3 when ap lied thereto. Besides this there is another tage in this particular construction, as I will now explain. It is almost impossible to make these pencils of uniform size, there being practically always variations caused in the bakinq'. Owing to the construction set forth of the cap, the latter can be readily fitted to the pencil. and if the cap fit the pencil too freely the pencil can be contracted onto the cap to prevent its being accidentally displaced. On the other hand the pencil if a little large can be driven into the cap and the latter will expand so that it can be properly connected to the pencil. It will be noticed that the lower portion of the body 5 oi the can is slightly flared outward. the.

flare being below the corrugated portion '2'. This permits proper entrance of the upper tip portion of the pencil into the cap. Obviously the cap or at last the body 5 thereof is sufiieiently resilient to conform properly to the size of pencil or pin to which it is connected. Owing to the fact that the cap is gated cap is a highly advantagemls manner of attaining it.

The top 6 has a central perforation to receive the post 8 equipped with collars as 5) 5 and 10 fitting against the upper and lower surfaces of the top to hold the post in place, this post receiving the binding nut 11 as is familiar in the'art. Complemental to the needle or pinB which constitutes one ter- 10 minal of the battery 2 is a second terminal denoted in a general way by 12. 1/

What I claim is: A cup for carbon pencils having approximately :1 eylindrieal body and a top, the body being, corrugated throughout its entire circumferential extent, the corrugations ex tending, short of the lower edge of the body and the body below the corrugations being flared outwardly.

In testimony whereof I allix my signature in the presence of two witnesses.

JOHANN (l. PETERSON.

Witnesses:

U. N. Wnunrr, Jr., W. J. (foLmxsoN, Jr. 

